reserve a,b,c,h for Integer;
reserve k,m,n for Nat;
reserve i,j,z for Integer;
reserve p for Prime;

theorem
  a is odd implies not a in multiples(2)
  proof
    assume
A1: a is odd;
    assume a in multiples(2);
    then a is Multiple of 2 by Th61;
    hence thesis by A1,Th77;
  end;
